The graphics software shown in this video (S-Graphics aka S-Products) partially outlived Symbolics and was evolved into Nichimen N-World and later Izware Mirai.
The last version is available on the Internet Archive: https://archive.org/details/izware_mirai_1.1sp2
The history of Symbolics Graphics Division is documented here: https://ohiostate.pressbooks.pub/graphicshistory/chapter/6-3...
The outstanding feature of the S-Graphics suite was the polygonal modeler which used a winged-edge structure that was far ahead of its time. It survives conceptually in the Wings3D system, which is a quite faithful copy of that modeler.
And of course you got the extensibility that came with the graphics system being built on Lisp.
But Symbolics was never, as far as I saw, a serious or popular contender in 3D production. Not only was the system expensive, but the hardware could not keep up with SGI's graphics abilities. Furthermore, the mass of CG developers at the time came from a C/Unix background, and rendering especially was so speed critical that C (and Fortran) resulted in faster systems.
Almost 40 years later, I have returned to the idea of developing a 3D system in Common Lisp [1]. We shall see where it leads.
[0] https://medium.com/@kaveh808/late-night-lisp-machine-hacking...